| 摘要 |
A circuit for the arcless de-energization of a direct current load receiving direct current from a rectified alternating current source. The circuit includes a means for rectifying alternating current from an alternating current source to provide direct current to the direct current load. The means for rectifying has a current flow controller, such as a silicon controlled rectifier, connected with each phase of the alternating current source. The circuit also has means for de-energizing the then conducting current flow controller in said means for rectifying, the means for de-energizing having a current flow controller, such as a silicon controlled rectifier. The circuit further includes a voltage detection device for detecting a predetermined voltage drop in the circuit; and a time delay device for regulating the activation of the means for de-energizing. The circuit includes means for providing an actuating signal to activate to a conductive state each current flow controller in the means for rectifying and the current flow controller in the means for de-energizing. A relay device is provided in the circuit for responding to a direct current overload and operates to disconnect the actuating signal from the means for rectifying and connect the actuating signal to the means for de-energizing through the time delay device when an overload is present.
|
